Feed device for the mandrels of machine tools of all kinds



M JANI CKE. "FEED DEVICE FOR THE M ANDREL S OF MACHINE TOOLS OF ALL KINDS.

' Patented "Dec. 13, 1921;

FEED DEVICE FOR THE ANnnnLs or smeg a roots or JAILLLV'I Knits.

, To all whom may concern at No. 13 Aenssf'ejre 'Delitsscherstr'asse,Hallee 5' on-the-Saale, Germany, manufacturer, have P invented certain new and-useful Improve ments in a Feed Device for the Mandrels of Machine-Tools of AllfKinds, (for which I have filed application .in- Germany, No. 10 16,925, filed June v29; 1914'; Austria, filed June 26,1915 ;'Hnngary,filedJune 26,1915, and'France, filed July 8, 1915,) 'of-which th e following is a. specification. I

The present invention relates to a feed 15 arrangement whichfmay be appliedto ma- 'chlnes for'various purposes, in which a tool or a piece of workhas to be fed. g g g In this drawing a constructional form of the'device is exemplified; if o Figure 1" is a section on the' lin'efA- B inFig.2.

, Fig. 2 is a section on the 111151 0 1) in r Fig. 1.

.The mandrel a carryingthe fltoolorthe work and driven by any suitablemeans (not shown) is threaded'along a considerable part of its length and is-screwed with this 7 thread into a nut 79, which has on the rim of a rearwardly'extending flange 0 an 1ninternal gear cl engages a pawl e, whichlis fitted loose on a pivot f. This'pivot is disposed in a lever g, which has at its front I end a nose It. This lever g is fitted at its rear end by means of a pin 2' revolubly to a face m of the nut b, and whichha's a bore to allow of the mandrelpassing'throngh it. Between the disk is and the nut is disposed in a corresponding recess a clutch'conen, whichengages with a feather or key 0 in a corresponding longitudinal groove in the 1 mandrel, and must therefore revolve con tinuously with said mandrel, but allows of a relative longitudinal displacement, w The pawl e is under action of a spring p, which tendsto hold the pawl inengagement with the said internal gear c l. At the rear end of the pawl e isp'rovided a tooth g, which likewise engages into the internal gear d.

At the side an abutment r is'disposed in against thesaid abntment 9 ternal ratchet gear (2; Into the teeth of said GRANTED-twine riini aovisrons or icwtraimami',41sm ;.1m. 1 I

' Specification of LettersPate nt ":Pate ted D e 1 1 1 fniiplicationfilednpril18,1916. .;Seria1No.'92,02 f., 1 7 1 'is'uc h amna er, that when; the disk/co. is .1 6; .5 R

valved, the nest it 'ofthe lever'y: strike; I

her or lever 9. Now. at one side of the mem-" The "oper'at' oii'ofthe dev ce is {as follows "When theimandrel is"rot'atedeither manu ally orjmechahically one. or f'the other V V I Ts'e'n'se', as indicated in theldrawin'g in Fig. 2, 1 in 'theclockwise direetiomit will carry with- 3 it the nut Z) ;by friction long as such; we, Ition' of said nut, is. not prevented. 1 Owing f 1 tothe engagement between theteeth cl and V V the ratchet memberla thenut carries with it 1 the member is which has thereonthe mem- 1 v 95 I her .70 is arfilxed abutmentfr; two faces of which are inclined-{totheihorizon talanda which"project intothe path of the end} it of-fthe member Duringthe first rotation} of the arm 9, the: nose or endithereof "h vstrikes against the labiitmentvr whereby the I rotation of the memberrlcpan-d inconse Q quenceof the ratchetengagementbetween it and the nut I also the"'furthe irotation of the nut is temporarily prevented. K ln conthread forward in the nut?) and willth'ereby' position, its forward movement is resisted by the pressure ofthe toolagainst the work and it now exerts an axialpressure against h the nut b inthe reversed direction to the; previousm'ovement' of the splndle a, so that the nut b forces the cone n tightly into the sequence thereof the spindle a will owing to. 1 itscontinued' rotation, screw itself with its member is and thereby couples the latter to} i the spindle a. In consequence thereof, the member is now strongly urged to'turn inx the clockwisedirection. with the-spindle a f as viewed in Fig. v2. 'This'movement of the a member/c is resisted bythe abutment 1' so' as to turn the flange 0 andflnut b intheu fo contra-clockwise direction*wit h *relation to the member 7a owing to'the engagement b e-f tween the ratchet e and the teeth 03. This, f-

relative motion, however, compresses the spring p and permits the lever g to sw ng inwardly away fromthe. abutment and 1'00 i j gi i thereby slips 'off'theabu'tment, the spring p "1 expandlng again as soon as'the nose f ps; I

past the abutment throwing the ratchet 6 forward on the teeth d in the clockwise direction and bringing the lever (1 again into the same relative position as shown asin Fig. 2. However, it will be seen that as the member or nut Z) is thus positively screwed in the contra-clockwise direction with relation to the spindle a, the spindle is posi-' tively screwed forward in 'the'direction of the arrow in Fig. 1 so that the tool at the forward end of the spindle is thrust positively into the metal being worked upon.-

This forward thrust,-of course, lasts only during a small portion of the revolution of the spindle, the spindle remaining statlonary as to longitudinalmovement untll the V nose it comes around again and strikes the abutment '1, The operation just described is then repeated the nose .h striking and slipping ofi the abutment once in each revolution and consequently giving the spindle a a forward thrust once in each 7 lBVOlllillOIl in order to feed the tool lnto the work at a relatively slow speed. Now when the tool has been advanced'far enough with relation to therwork, the rotation of the mandrel is reversed, and the nose h i so strikes the abutment r at the opposite end or the nose whereby the tooth g is forced against the teeth 65 and there being no way for the lever g to slip or for the member 6 i to slide owingto' the relative inclination of the contacting surfaces of the teethjq and the teeth cZ,'the nut Z) is positively locked and the spindle a 'moves' rapidly backward. From the foregolng lt wlll be seen that I have provided an arrangement whereby the tool will be rapidly advanced into cutting position and removed from cutting position when required, but will be fed forward slowly during the actual progress of the work. a i V V 7 Having thus described my invention, I. claim: 7

l. A feed device for a mandrel of machine I tools comprising in combination a'nut, a mandrel having threaded engagement with said nut, and means for continuously preventing the rotation of said nut during the idle travel of the mandrel, and means whereby said nut isfarrested intermittently upon resistance being applied to themandrel during its feeding motion.

2. Feed device for the mandrel of machine tools of all kinds, especially drilling machines, comprisingga nut, the mandrel screwing with a thread n said nut, said nut fitted with an lnternal ratchet gear,"

a doubleended pawl, adapted to engage with either end in said internalgear, a lever 6 having a pin on which said pawl is fitted loose, a disk memberhaving a'bore through which said mandrel passes,said lever being pivoted to said disk 'membe'r,on said lever a nose, an abutment disposed at one side and 5 adapted to engage with said nose and thereby arrest said nut, recesses in said vdisk memher and said nut, in said recesses a clutch cone axially displaceable on, but positively,

revoluble with said mandrel, and adapted 

